VEVOR Chimney Sweep Kit 23FT Length, Chimney Brush Kit with 7 Nylon Flexible Rods, Rotary Chimney Cleaning Kit Driven by Drill, Chimney Cleaning Tool Kits for Sweeping Fireplace Flue

The nylon bristle of our chimney brush is helical and flexible, so you don't need to trim the bristle short. With the driving force and centrifugal force from the drill chuck, our chimney brush can be used to high efficiently clean the chimneys(note, without soft lining) of inner diameter from 100mm~700mm (i.e. 4~28 inches).

1/ The opening size of 3.5" is ok, our brush and rods can be insert through it easily.<br/>2/ Our chimney brush is designed for sweeping chimney/duct ( either bricks, or stone or steel material) without soft lining. <br/>The nylon bristle of our chimney brush is helical and flexible, no need trim the bristle short, with the driving force and centrifugal force from the drill chuck, our chimney brush can be used to high efficiently clean chimneys(without soft lining) of inner diameter from 100mm~700mm（i.e. 4~28 inches ）.